CN113806999B - Method and device for determining water dew point index value of gas pipeline - Google Patents
Method and device for determining water dew point index value of gas pipeline Download PDFInfo
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Abstract
The disclosure provides a method and a device for determining a water dew point index value of a gas pipeline, and belongs to the technical field of pipelines. The determination method comprises the steps of determining the gas to be conveyed in the pipeline to be detected; acquiring the lowest temperature and the operating pressure of a pipeline to be detected when the pipeline is used for conveying gas under different operating conditions; determining construction water dew point values respectively corresponding to the pipelines to be tested under different operation working conditions according to the lowest temperature and the operation pressure of each group; fitting is carried out on the basis of the multiple groups of the lowest temperature and the operation pressure and the corresponding construction water dew point values, and a fitting data equation of the water dew point index value with respect to the temperature and the operation pressure is obtained; and obtaining a corresponding water dew point index value according to the fitting data equation and the actual temperature and the actual pressure of the pipeline to be detected, which are measured during drying acceptance. The method for determining the water dew point index value of the gas transmission pipeline can quickly and accurately determine the normal pressure water dew point value of the pipeline to be tested for drying acceptance.
Description
Technical Field
The disclosure belongs to the technical field of pipelines, and particularly relates to a method and a device for determining a water dew point index value of a gas pipeline.
Background
Before a natural gas pipeline is about to be put into natural gas for pipeline tightness test, the pipeline inner wall is prevented from being corroded, the pipe wall roughness is reduced, the pipeline conveying efficiency is improved, and in the natural gas putting-into process, the pipeline is prevented from being blocked by hydrate, the operation of the natural gas is influenced, and the gas pipeline must be dried and checked. The result of drying acceptance is often represented by a water dew point, which is a temperature at which condensation just begins to occur on the surface of the pipeline under the conditions of the ambient temperature and the relative humidity. A lower water dew point temperature of the duct indicates a higher degree of drying of the air in the duct.
In the related technology, the index value of the water dew point during the drying test of the domestic gas transmission pipeline is generally formulated according to SYT4114-2008 'drying construction technical specification of the natural gas transmission pipeline', when the air water dew point at the tail end outlet of the pipeline reaches-20 ℃, the pipeline is sealed for 4 hours in a micro-positive pressure (0.05-0.07 MPa) environment, then the water dew point detection is carried out on the tail end outlet of the pipeline, and the acceptance is qualified when the air water dew point reaches below-20 ℃ and rises to no more than 3 ℃.
However, since the water dew point value in the gas transmission pipeline is related to the operating pressure of the pipeline, the larger the pressure is, the larger the water dew point value is, so that the fixed water dew point index value cannot adapt to pipelines in different operating environments.
Disclosure of Invention
The embodiment of the disclosure provides a method and a device for determining a water dew point index value of a gas transmission pipeline, which can quickly and accurately determine a drying acceptance water dew point index value in the gas transmission pipeline to be detected. The technical scheme is as follows:
the embodiment of the disclosure provides a method for determining a water dew point index value of a gas pipeline, which comprises the following steps:
determining gas to be conveyed in a pipeline to be detected;
acquiring the lowest temperature and the operating pressure of the pipeline to be detected when the pipeline to be detected conveys the gas under different operating conditions;
determining construction water dew point values respectively corresponding to the pipeline to be tested under different operation working conditions according to the lowest temperature and the operation pressure of each group;
fitting is carried out on the basis of the multiple groups of the lowest temperature and the operation pressure and the corresponding construction water dew point values, and a fitting data equation of the water dew point index value with respect to the temperature and the operation pressure is obtained;
and obtaining a corresponding water dew point index value according to the fitting data equation and the actual temperature and the actual pressure of the pipeline to be detected, which are measured during drying acceptance.
In another implementation manner of the present disclosure, the determining, according to each group of the minimum temperature and the operating pressure, the construction water dew point values corresponding to the pipeline to be tested under different operating conditions respectively includes:
determining the water content in the pipeline to be detected according to the lowest temperature and the operation pressure of each group;
and calculating to obtain the construction water dew point values respectively corresponding to the pipelines to be detected under different operating conditions according to the water content in the pipelines to be detected.
In another implementation manner of the present disclosure, the fitting based on the multiple sets of the lowest temperature and the operating pressure and the corresponding construction water dew point values to obtain a fitting data equation of the water dew point index values with respect to the temperature and the operating pressure includes:
performing regression analysis on each construction water dew point value through a back propagation algorithm to obtain a missing water dew point value in the pipeline to be detected, wherein the missing water dew point value is the construction water dew point value corresponding to the pipeline to be detected under an unknown operation condition;
and carrying out optimization fitting on the construction water dew point value and the missing water dew point value together to obtain the fitting data equation.
In another implementation manner of the present disclosure, the optimally fitting the construction water dew point value and the missing water dew point value together to obtain the fitting data equation includes:
performing optimization fitting on the construction water dew value and the missing water dew value by using a Marquardt method and a general global optimization method to obtain the following optimization fitting formula:
wherein, T0The water dew point index value is the water dew point index value when the pipeline to be detected is received, and the unit is; t is a unit ofminIs the actual temperature in units of; p ismaxIs the actual pressure in MPa; a1-a11 are fitting coefficients obtained in the fitting process.
In another implementation manner of the present disclosure, the determining method further includes:
the actual temperature is the lowest temperature in the pipeline to be tested within 30 days before the pipeline to be tested is dried and constructed and 30 days after the pipeline to be tested is constructed;
the actual pressure is the average value of the pressure of the pipeline to be detected running from 30 days before dry construction to 30 days after the construction.
In yet another implementation manner of the present disclosure, the determining means includes:
the pipeline gas transmission confirming module is used for confirming gas to be transmitted in the pipeline to be detected;
the temperature and pressure acquisition module is used for acquiring the lowest temperature and the lowest operating pressure of the pipeline to be detected when the pipeline to be detected conveys the gas under different operating conditions;
the construction water dew point value acquisition module is used for determining construction water dew point values respectively corresponding to the pipeline to be tested under different operation working conditions according to the lowest temperature and the operation pressure of each group;
the fitting data equation establishing module is used for fitting based on the multiple groups of the lowest temperature and the operating pressure and the corresponding construction water dew point values to obtain a fitting data equation of the water dew point index values with respect to the temperature and the operating pressure;
and the water dew point index value calculation module is used for obtaining a corresponding water dew point index value according to the fitting data equation and the actual temperature and the actual pressure of the pipeline to be detected, which are measured during drying acceptance.
In yet another implementation manner of the present disclosure, the construction water dew point value obtaining module is further configured to,
determining the water content in the pipeline to be detected according to the lowest temperature and the operation pressure of each group;
and calculating to obtain the construction water dew point values respectively corresponding to the pipelines to be detected under different operating conditions according to the water content in the pipelines to be detected.
In yet another implementation of the present disclosure, the fitting data equation establishing module is further configured to,
performing regression analysis on each construction water dew point value through a back propagation algorithm to obtain a missing water dew point value in the pipeline to be detected, wherein the missing water dew point value is the construction water dew point value corresponding to the pipeline to be detected under an unknown operation condition;
and carrying out optimization fitting on the construction water dew point value and the missing water dew point value together to obtain the fitting data equation.
In yet another implementation of the present disclosure, the fitting data equation establishing module is further configured to,
performing optimization fitting on the construction water dew value and the missing water dew value by using a Marquardt method and a general global optimization method to obtain the following optimization fitting formula:
wherein, T0The water dew point index value is the water dew point index value when the pipeline to be detected is received, and the unit is; t is a unit ofminThe actual temperature is expressed in units of; p ismaxIs the actual pressure in MPa; a1-a11 are fitting coefficients obtained in the fitting process.
In another implementation manner of the present disclosure, the temperature and pressure obtaining module is further configured to obtain an actual temperature and an actual pressure when the pipeline to be tested is subjected to drying acceptance,
the actual temperature is the lowest temperature in the pipeline to be detected within 30 days before dry construction and 30 days after construction;
the actual pressure is the average value of the pressure of the pipeline to be tested running from 30 days before the drying construction to 30 days after the construction.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
when the method for determining the water dew point index value of the gas transmission pipeline provided by the embodiment of the disclosure is used for determining the water dew point index value of the pipeline to be detected, the gas to be transmitted and the actual operation condition of the pipeline to be detected need to be determined firstly because the corresponding operation conditions in the pipeline to be detected are different, and the water dew point index values of the pipeline to be detected corresponding to different operation conditions are different because the actual operation conditions corresponding to different gases are different. And then, acquiring the lowest temperature and the operating pressure of the pipeline to be detected when the pipeline to be detected conveys gas under different operating conditions. Because the corresponding temperature and pressure of the gas in the pipeline to be detected are different during conveying, and the lowest temperature and the operating pressure in the pipeline to be detected have great influence on the water dew point index value of the pipeline under different operating conditions, the corresponding lowest temperature and operating pressure need to be determined. And then, according to the lowest temperature and the operation pressure of each group, determining a plurality of construction water dew point values corresponding to the pipeline to be detected when the pipeline is used for conveying gas, and indirectly guiding a water dew point index value to be determined in the pipeline to be detected through the existing construction water dew point values, namely reversely determining the water dew point index value in the pipeline to be detected through the construction water dew point values in the actual operation working condition of the pipeline to be detected, so that the water dew point index value can be more fit with the actual operation condition of the pipeline. And finally, performing data fitting on the existing construction water dew point value and the lowest temperature and the operating pressure in the pipeline to be tested to obtain a fitting data equation, and directly calculating the water dew point index value when the pipeline to be tested is accepted through the fitting data equation. The method for determining the water dew point index value of the gas transmission pipeline provided by the embodiment of the disclosure can enable the determined water dew point index value to be more accurate due to consideration of the actual operation condition of the pipeline to be detected, has simple steps and convenient operation, can rapidly and accurately determine the water dew point index value of the pipeline to be detected, can meet the requirements of field engineering, and ensures the dry construction effect of the pipeline.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is apparent that the drawings in the description below are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings may be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for determining a water dew point index value of a gas transmission pipeline according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of another method for determining a water dew point index value of a gas pipeline according to an embodiment of the present disclosure;
fig. 3 is a schematic block diagram of a device for determining a water dew point index value of a gas transmission pipeline according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
The embodiment of the disclosure provides a method for determining a water dew point index value of a gas transmission pipeline, as shown in fig. 1, the method comprises the following steps:
s101: and determining the gas to be conveyed in the pipeline to be detected.
S102: and acquiring the lowest temperature and the operating pressure of the pipeline to be detected when the pipeline to be detected conveys gas under different operating conditions.
S103: and determining the construction water dew point values of the pipeline to be measured under different operation conditions according to the minimum temperature and the operation pressure of each group.
S104: and fitting based on multiple groups of minimum temperatures, operating pressures and corresponding construction water dew points to obtain a fitting data equation of the water dew point index values with respect to the temperatures and the operating pressures.
S105: and obtaining a corresponding water dew point index value according to the fitting data equation and the actual temperature and the actual pressure of the pipeline to be measured, which are measured during drying acceptance.
When the method for determining the water dew point index value of the gas transmission pipeline provided by the embodiment of the disclosure is used for determining the water dew point index value of the pipeline to be detected, the gas to be transmitted and the actual operation condition of the pipeline to be detected need to be determined firstly because the corresponding operation conditions in the pipeline to be detected are different, and the water dew point index values of the pipeline to be detected corresponding to different operation conditions are different because the actual operation conditions corresponding to different gases are different. And then, acquiring the lowest temperature and the operating pressure of the pipeline to be detected when the pipeline to be detected conveys gas under different operating conditions. Because the corresponding temperature and pressure of the gas in the pipeline to be detected are different during conveying, and the lowest temperature and the operating pressure in the pipeline to be detected have great influence on the water dew point index value of the pipeline under different operating conditions, the corresponding lowest temperature and operating pressure need to be determined. And then, according to the lowest temperature and the operation pressure of each group, determining a plurality of construction water dew point values corresponding to the pipeline to be detected when the pipeline is used for conveying gas, and indirectly guiding a water dew point index value to be determined in the pipeline to be detected through the existing construction water dew point values, namely reversely determining the water dew point index value in the pipeline to be detected through the construction water dew point values in the actual operation working condition of the pipeline to be detected, so that the water dew point index value can be more fit with the actual operation condition of the pipeline. And finally, performing data fitting on the existing construction water dew point value and the lowest temperature and the operating pressure in the pipeline to be tested to obtain a fitting data equation, and directly calculating the water dew point index value when the pipeline to be tested is accepted through the fitting data equation.
The method for determining the water dew point index value of the gas transmission pipeline provided by the embodiment of the disclosure can enable the determined water dew point index value to be more accurate due to consideration of the actual operation condition of the pipeline to be detected, has simple steps and convenient operation, can rapidly and accurately determine the water dew point index value of the pipeline to be detected, can meet the requirements of field engineering, and ensures the dry construction effect of the pipeline.
Fig. 2 is a flowchart of another method for determining a water dew point index value of a gas transmission pipeline according to an embodiment of the present disclosure, and with reference to fig. 2, the determining method includes:
s201: and determining the gas to be conveyed in the pipeline to be detected.
In the implementation manner, when the pipeline is actually transported, the corresponding transported gas is different, and the water dew point index values of the pipelines corresponding to different gases are different, so in order to accurately determine the water dew point index value in the pipeline to be measured subsequently, the gas to be transported by the pipeline to be measured is determined first.
S202: and acquiring the lowest temperature and the operating pressure of the pipeline to be detected when the pipeline to be detected conveys gas under different operating conditions.
In the above implementation manner, the water dew point index value in the pipeline to be measured is related to the operating pressure and the lowest temperature in the transportation condition of the pipeline to be measured, that is, the water dew point index value in the pipeline to be measured has a direct relationship with the operating pressure and the lowest temperature of the transportation gas in the pipeline to be measured, so that in order to subsequently and accurately determine the water dew point index value in the pipeline to be measured, the operating pressure and the lowest temperature corresponding to the actual operation condition of the pipeline to be measured are determined.
S203: and determining the construction water dew point values of the pipeline to be detected under different operation conditions according to the lowest temperature and the operation pressure of each group.
In the implementation manner, since the corresponding actual operating conditions in the pipeline to be measured are different, in order to accurately determine the water dew point index value of the pipeline to be measured, the known construction water dew point value can be used to further guide the determination of the unknown water dew point index value.
Illustratively, step S203 is implemented by:
3.1, determining the water content in the pipeline to be detected according to the lowest temperature and the operation pressure of each group;
it should be noted that the minimum temperature here is a value obtained by taking the minimum temperature in the actual corresponding operation condition as low as 5 ℃ according to the calculation requirement of the construction water dew point of the gas pipeline.
And 3.2, calculating to obtain a plurality of corresponding construction water dew values of the pipeline to be detected under different operation working conditions according to the water content of the pipeline to be detected.
In the embodiment, the construction water dew point value of the pipeline to be measured under different pressures and temperatures is determined through the conversion between the natural gas water content and the water dew point in the national standard GB/T22634-2008.
In addition, the first and second substrates are,
s204: and performing regression analysis on each construction water dew value through a back propagation algorithm to obtain a missing water dew value in the pipeline to be detected, wherein the missing water dew value is the corresponding construction water dew value of the pipeline to be detected under an unknown operation condition.
In the implementation manner, since different operating pressures and minimum temperatures in the pipeline to be measured are limited to a few or tens of operating pressures and minimum temperatures, the construction water dew point value calculated by GB/T22634-2008 "conversion between natural gas water content and water dew point" is also limited, that is, the corresponding construction water dew point value data amount in the pipeline to be measured is too small, and in order to make the fitting data equation fitted in step S205 more accurate, data required in the fitting process needs to be supplemented.
In this embodiment, a BP neural network regression is used to obtain the missing water dew value.
S205: and carrying out optimization fitting on the construction water dew point value and the missing water dew point value together to obtain a fitting data equation.
In the implementation mode, all the construction water dew point values and the missing water dew point values are subjected to optimization fitting, and a relation function related to the water dew point index value of the pipeline to be measured, the actual temperature and the operating pressure can be obtained.
Illustratively, step S205 is implemented by:
performing optimization fitting on the construction water dew point value and the missing water dew point value by using a Marquardt method and a general global optimization method to obtain the following optimization fitting formula:
in equation (1): t is a unit of0The index value of the water dew point when the pipeline to be detected is received is the unit of; t isminIs the actual temperature in units of; pmaxActual pressure in MPa; a1-a11 are fitting coefficients obtained in the fitting process.
S206: and obtaining a corresponding water dew point index value according to the fitting data equation and the actual temperature and the actual pressure of the pipeline to be measured, which are measured during drying acceptance.
Optionally, the actual temperature is the lowest temperature in the pipe to be tested from 30 days before dry construction to 30 days after the construction.
The actual pressure is the average value of the pressure of the pipeline to be measured running from 30 days before the drying construction to 30 days after the construction.
In the implementation mode, the actual temperature and the actual pressure of the pipeline to be tested during gas transportation are correspondingly substituted into the optimization fitting formula, so that the water dew point index value of the pipeline to be tested during acceptance can be obtained.
Fig. 3 is a schematic block diagram of a device for determining a water dew point index value of a gas pipeline according to an embodiment of the present disclosure, and with reference to fig. 3, the device for determining a water dew point index value of a gas pipeline includes:
and the pipeline gas transmission confirming module 1 is used for confirming gas to be transmitted in the pipeline to be detected.
And the temperature and pressure acquisition module 2 is used for acquiring the lowest temperature and the lowest operating pressure of the pipeline to be detected when the pipeline to be detected conveys gas under different operating conditions.
And the construction water dew point value acquisition module 3 is used for determining the construction water dew point values respectively corresponding to the pipeline to be tested under different operation working conditions according to the lowest temperature and the operation pressure of each group.
And the fitting data equation establishing module 4 is used for fitting based on multiple groups of minimum temperatures, operating pressures and corresponding construction water dew point values to obtain a fitting data equation of the water dew point index values with respect to the temperatures and the operating pressures.
And the water dew point index value calculation module 5 is used for obtaining a corresponding water dew point index value according to the fitting data equation and the actual temperature and the actual pressure of the pipeline to be detected measured when drying acceptance is carried out.
In the above implementation, the determining apparatus has all the beneficial effects of the determining method shown in fig. 1, and is not described herein again.
Optionally, the temperature and pressure obtaining module 2 is further configured to obtain an actual temperature and an actual pressure when the pipeline to be tested is dried and accepted, where the actual temperature is a lowest temperature in the pipeline to be tested from 30 days before the drying construction to 30 days after the construction;
the actual pressure is the average value of the pressure of the pipeline to be measured running from 30 days before the drying construction to 30 days after the construction.
In the implementation mode, the actual working condition corresponding to the pipeline to be tested when the pipeline to be tested is subjected to drying acceptance can be determined by monitoring the average values of the corresponding minimum temperature and the corresponding minimum pressure in the pipeline to be tested in the previous month and the next month of the drying construction, and the water dew point index value of the pipeline to be tested is determined according to the actual working condition, so that the water dew point index value is more accurate.
Optionally, the construction water dew point value obtaining module 3 is further configured to determine the water content in the pipeline to be measured according to the minimum temperature and the operation pressure of each group;
and calculating to obtain the construction water dew point values of the pipeline to be detected under different operating conditions according to the water content in the pipeline to be detected.
In the implementation manner, different construction water dew point values corresponding to different operation conditions in the pipeline to be tested can be determined through the construction water dew point value obtaining module 3, so that the method in fig. 1 is ensured to be smoothly implemented, and the subsequent calculation of the water dew point index value in the pipeline to be tested is facilitated.
Optionally, the fitting data equation establishing module 4 is further configured to perform regression analysis on each construction water dew value through a back propagation algorithm to obtain a missing water dew value in the to-be-measured pipeline, where the missing water dew value is a construction water dew value corresponding to the to-be-measured pipeline under an unknown operating condition;
and carrying out optimization fitting on the construction water dew point value and the missing water dew point value together to obtain a fitting data equation.
In the implementation manner, since the construction water dew point values corresponding to the pipeline to be measured under different operation conditions, which are determined by GB/T22634-2008 "conversion between natural gas water content and water dew point", are within a limited range, that is, the data volume is not very large, the determined construction water dew point values need to be expanded, so that the data volume is increased, and a data basis is made for subsequently fitting a data equation.
Optionally, the fitting data equation establishing module 4 is further configured to perform optimal fitting on the construction water dew point value and the missing water dew point value by using a maquardt method and a general global optimization method, and obtain the following optimal fitting formula:
in equation (2): t is0The index value of the water dew point when the pipeline to be detected is received is the unit of; t isminIs the actual temperature in units of; pmaxActual pressure in MPa; a1-a11 are fitting coefficients obtained in the fitting process.
In the implementation mode, the data are optimized through a Marquardt method and a general global optimization method, and the correlation among the lowest temperature, the operation pressure and the water dew point index value in the pipeline to be measured can be obtained quickly.
In order to further explain the implementation of the method for determining the water dew point index value of the gas transmission pipeline provided by the embodiment of the disclosure, the following specific examples are selected for explanation:
first, a pipeline to be tested is selected, and the corresponding gas component to be transported in the pipeline to be tested is determined, as shown in table 1 below.
TABLE 1 molar content of gas component in a pipeline to be tested%
| C1 | C2 | C3 | C4 | C5 | N2 | CO2 | He | H2 |
| 91.41 | 4.93 | 0.96 | 0.41 | 0.24 | 1.63 | 0.06 | 0.29 | 0.07 |
C1 and C2 each represent the number of carbon atoms in the gas, wherein C1 is CH4And C2 is C2H6And so on.
Meanwhile, the actual pressure of the pipeline to be tested in the drying and testing process is 10MPa and the actual temperature is 7 ℃ through the temperature and pressure acquisition module 2.
Then, by using GB/T22634-2008 "conversion between natural gas water content and water dew point", the construction water dew point value of the pipeline under different lowest temperatures and operating pressures in different operating conditions can be calculated (see Table 2).
TABLE 2 Water dew Point values for pipeline construction at different minimum gas temperatures and operating pressures
And then, performing regression analysis on the construction water dew value through a back propagation algorithm to obtain the missing water dew value in the pipeline to be detected.
For the data in table 2, missing water dew values include: the construction water dew point values corresponding to 4MPa, 5MPa, minus 15 ℃ and minus 10 ℃ are lacked. The missing water dew value is determined using a back propagation algorithm.
Then, carrying out optimization fitting on the construction water dew point value and the missing water dew point value together to obtain a fitting data equation, wherein the form of the fitting data equation is as follows:
in equation (3): t is0The index value of the water dew point when the pipeline to be detected is received is the unit of; t isminThe actual temperature of the pipeline to be measured in the actual gas conveying process is expressed in units of; pmaxThe actual pressure of the pipeline to be measured in actual gas conveying is MPa; a1-a11 are fitting coefficients obtained in the fitting process.
After fitting is performed on the data in table 2 and the above missing water dew point value, the correlation coefficient of the optimized fitting formula is 0.9995, the mean square error is 0.35, and the sum of the differences is 9.7, so that the fitting effect is good by the above method.
And finally, substituting the actual temperature and the actual pressure in the pipeline into a fitting data equation, and conveniently and quickly calculating the water dew point index value of the pipeline to be-42.99 ℃.
If the water dew point index value is calculated by using GB/T22634-2008 'conversion between natural gas water content and water dew point', the method needs to combine a PR gas state equation, and conduct gas and liquid phase fugacity coefficient formulas through a phase equilibrium theory based on a correlation curve provided by GB/T22634-2008, and finally carry out iterative solution. The calculation process is complex, and the calculation result is-42.97 ℃.
To sum up, the method for determining the water dew point index value of the gas pipeline provided by the embodiment can be popularized and applied to all domestic gas pipeline drying construction acceptance, ensures the drying effect after the pipeline is put into production and runs by determining the water dew point index value of the drying acceptance, provides technical support for the safe operation of the gas pipeline, and has a wide popularization and application prospect.
The above description is meant to be illustrative of the principles of the present disclosure and not to be taken in a limiting sense, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.
Claims (6)
1. A method for determining a water dew point index value of a gas transmission pipeline is characterized by comprising the following steps:
determining gas to be conveyed in a pipeline to be detected;
acquiring the lowest temperature and the operating pressure of the pipeline to be detected when the pipeline to be detected conveys the gas under different operating conditions;
determining construction water dew point values respectively corresponding to the pipeline to be tested under different operation working conditions according to the lowest temperature and the operation pressure of each group;
performing regression analysis on each construction water dew point value through a back propagation algorithm to obtain a missing water dew point value in the pipeline to be detected, wherein the missing water dew point value is the construction water dew point value corresponding to the pipeline to be detected under an unknown operation condition;
performing optimization fitting on the construction water dew value and the missing water dew value by using a Marquardt method and a general global optimization method to obtain the following optimization fitting formula:
wherein, T0The water dew point index value is the water dew point index value when the pipeline to be detected is received, and the unit is; t isminIs the actual temperature in units of; p ismaxIs the actual pressure in MPa; a1-a11 are fitting coefficients obtained in the fitting process to obtain the fitting data equation;
and obtaining a corresponding water dew point index value according to the fitting data equation and the actual temperature and the actual pressure of the pipeline to be detected, which are measured during drying acceptance.
2. The determination method according to claim 1, wherein the determining the construction water dew point values of the pipeline to be tested respectively corresponding to different operation conditions according to the lowest temperature and the operation pressure of each group comprises:
determining the water content in the pipeline to be tested according to the lowest temperature and the operation pressure of each group;
and calculating to obtain the construction water dew point values respectively corresponding to the pipelines to be detected under different operating conditions according to the water content in the pipelines to be detected.
3. The method of claim 1, further comprising:
the actual temperature is the lowest temperature in the pipeline to be tested within 30 days before the pipeline to be tested is dried and constructed and 30 days after the pipeline to be tested is constructed;
the actual pressure is the average value of the pressure of the pipeline to be tested running from 30 days before the drying construction to 30 days after the construction.
4. A device for determining a water dew point index value of a gas transmission pipeline, the device comprising:
the pipeline gas transmission confirming module is used for confirming gas to be transmitted in the pipeline to be detected;
the temperature and pressure acquisition module is used for acquiring the lowest temperature and the lowest operating pressure of the pipeline to be detected when the pipeline to be detected conveys the gas under different operating conditions;
the construction water dew point value acquisition module is used for determining construction water dew point values respectively corresponding to the pipeline to be tested under different operation working conditions according to the lowest temperature and the operation pressure of each group;
the fitting data equation establishing module is used for performing regression analysis on each construction water dew value through a back propagation algorithm to obtain a missing water dew value in the pipeline to be detected, wherein the missing water dew value is the construction water dew value corresponding to the pipeline to be detected under an unknown operation condition; and performing optimization fitting on the construction water dew point value and the missing water dew point value by using a Marquardt method and a general global optimization method to obtain the following optimization fitting formula:
wherein, T0The water dew point index value is the water dew point index value when the pipeline to be detected is received, and the unit is; t isminIs the actual temperature in units of; pmaxIs the actual pressure in MPa; a1-a11 are fitting coefficients obtained in the fitting process to obtain the fitting data equation;
and the water dew point index value calculation module is used for obtaining a corresponding water dew point index value according to the fitting data equation and the actual temperature and the actual pressure of the pipeline to be detected, which are measured during drying acceptance.
5. The determination apparatus according to claim 4, wherein the construction water dew point value obtaining module is further configured to,
determining the water content in the pipeline to be detected according to the lowest temperature and the operation pressure of each group;
and calculating to obtain the construction water dew point values respectively corresponding to the pipelines to be detected under different operating conditions according to the water content in the pipelines to be detected.
6. The apparatus according to claim 4, wherein the temperature and pressure obtaining module is further configured to obtain an actual temperature and an actual pressure when the pipeline to be tested is subjected to drying acceptance,
the actual temperature is the lowest temperature in the pipeline to be detected within 30 days before dry construction and 30 days after construction;
the actual pressure is the average value of the pressure of the pipeline to be detected running from 30 days before dry construction to 30 days after the construction.
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